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QSopt | ||
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Function List |
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| Purpose | ||||||||||
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Obtain the dual value associated with a named row. | |||||||||
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| Synopsis | ||||||||||
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int QSget_named_pi (QSprob p, const char *rowname, double *val) | |||||||||
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| Returns | ||||||||||
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A zero value if the function terminated correctly, and a non-zero value if an error occurred. Note that QSget_named_pi returns an error code if it is called with a specified problem that has not been solved with one of the optimization functions ( QSopt_dual or QSopt_primal) since the last time the problem was loaded or modified. An error will also occur if the named constraint is not in the LP problem. | |||||||||
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| Description | ||||||||||
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After a successful call to one of the optimization routines ( QSopt_dual or QSopt_primal), this function can be used to obtain the value of the dual variable associated with a constraint specified by name. | |||||||||
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| Example | ||||||||||
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/* p is an initialized QSprob, a handle to an existing LP problem */
/* Get the value of the dual variable for constraint r2. */
int rval;
double val;
rval = QSget_named_pi (p, "r2", &val);
if (rval) {
fprintf (stderr,
"Could not get the dual value, error code %d\n", rval);
} else {
printf ("Dual value = %.6f\n", val);
}
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